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Three stratally disrupted chaotic units crop out within a horst in west-central Maine. These mélanges and olistostromes are below, within, and above a 2.4-km-thick sequence of ophiolitic metabasalt. Each is characterized by a predominantly pelitic matrix. Textures of the matrix range from slate through phyllite to very fine grained schist. The chaotic units are differentiated by the structures within the matrix, and the lithology and structures of the inclusions.

The matrix of the Loon Stream mélange is characterized by slaty cleavage. The inclusions are metasandstones and metarhyolites. The metasandstone inclusions exhibit layer-parallel extension and layer-normal shears. This mélange is interpreted...

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